HVAC Guys Low Loss Fittings HVAC | 5/16in x 1/4in Solid Brass Heavy Duty HVAC Quick Connect Fittings 410a | Anti-Blow Back Adapter R-410A COMPATIBLE HVAC LOW LOSS FITTINGS - With a 800psi operating pressure and 4000psi burst pressure, our fittings can be used with 410A and other high pressure refrigerants. Suitable for use with R-410A, 134A, R22, R290, R600a, and all CFC, HFC, HCFC refrigerants. This is also suitable for use with mineral, POE, and all types of refrigeration oils. SAFEGUARD YOUR FINGERS - This Anti-Blow Back Adapter will close automatically upon disconnection from the system, trapping excess refrigerant in the hoses and preventing refrigerant burns to your fingers. MINIMIZE REFRIGERANT LOSS - Save refrigerant and help comply with non-venting regulations. These low loss fittings help safeguard your fingers and minimize refrigerant loss when disconnecting hoses from a system during charging or service. SOLID BRASS CONSTRUCTION - Each low loss fitting is machined from Solid Brass bar stock. The seals are industrial grade materials specifically designed to be used with HVAC refrigerants and oils. Additional rubber gaskets are included for servicing. COMPATIBLE WITH ALL STANDARD HOSES - This adapter is compatible with all standard 1/4in hoses and 5/16in service ports. Please note, some 410A systems use 1/4” service ports. This will NOT fit on 1/4"" service ports. DESIGNED IN THE USA BY HVAC PROFESSIONALS - We have designed our products to meet and exceed the highest standards within the HVAC Industry. These are the same hvac manifold hoses we use in our own jobs. 100% SATISFACTION WITH OUR HVAC TOOLS - Our company is owned and operated by EPA card holding HVAC technicians. These are the same tools we use on our own jobs and we stand behind them 100%. If you are not completely satisfied, please reach out to us directly and we will gladly make it right!